"Not scientifically validated," is being awfully generous. It doesn't work, plain and simple. The facilitator is the one responding in 100% of cases.
You not only can see the father guiding his hand, but Daniel isn't even looking at the board. I would challenge anyone to respond to a question by poking at an iPad, without looking, while someone else holds their hand.
Because a autistic person don't look directly to you don't mean is not looking at you. Is very common to them of see "away" and pay attention to thing in front or in a side.
The problem is, is VERY hard to decipher what a autistic person is doing and why.
You not only can see the father guiding his hand, but Daniel isn't even looking at the board. I would challenge anyone to respond to a question by poking at an iPad, without looking, while someone else holds their hand.